Java ActionListener is an interface in Java used to handle action events, such as button clicks, from Java's GUI components. It includes the Java method Java actionPerformed(), which is invoked when an action event occurs. Introduced in Java 1995 with Java 1.0, ActionListener is fundamental for building interactive Java applications, enabling developers to respond to user input in real-time.

https://docs.oracle.com/javase/8/docs/api/java/awt/event/ActionListener.html

Java ActionListener is an interface in Java that listens for action events, such as button clicks or menu selections, in graphical user interface (GUI) applications. It defines a single method, `actionPerformed(ActionEvent e)`, which is called whenever the associated action occurs. The ActionListener interface is commonly used in AWT (Abstract Window Toolkit) and Swing applications, allowing developers to define how their application should respond to user input.

When a user interacts with a component, such as clicking a button or selecting a menu item, an action event is generated. The component triggers the `actionPerformed()` method in any ActionListener that has been registered to listen for that event. This makes ActionListener essential for event-driven programming, as it allows developers to respond to user actions and update the interface or application logic accordingly.

Java ActionListener was introduced in Java 1995 with Java 1.0 as part of the AWT package. Since then, it has been widely used in building interactive desktop applications. ActionListener interfaces are integral to programs that use buttons, text fields, or other components that involve user interaction.

The ActionListener interface allows for clear and modular event handling, promoting separation of concerns between the user interface and application logic. This is crucial for creating maintainable and reusable code. More details about implementing ActionListener can be found in the official Java documentation.

https://docs.oracle.com/javase/8/docs/api/java/awt/event/ActionListener.html